Pig farming in the Northeast of Trás-os-Montes has been documented since pre-Christian times, as evidenced by the "berrões" (boars), granite sculptures in the shape of pigs, and the pig tributes mentioned in the Charters of the region's municipalities. For centuries, the Bísaro pig was the pillar of the family economy
of these mountains.

Traditional extensive farming: animals live outdoors and are only stabled in harsh winters. They eat cereals (wheat, corn, rye, oats), vegetables and fruit; in October and November, they go to the chestnut groves to eat fallen chestnuts. At Bísaro, this rearing method is practised in-house, within the Montesinho Natural Park.

Carne de Bísaro Transmontano PDO: Bísaro breed animals traditionally raised in Bragança and Vila Real. And the products: Presunto Bísaro de Vinhais PGI, Alheira de Vinhais PGI, Salpicão de Vinhais PGI, Chouriça de Carne de Vinhais PGI and Butelo de Vinhais PGI. European labels that guarantee origin, breed, and method.

The Bísaro almost disappeared in the 20th century with the advance of industrial breeds. Its recovery is due to breeders and ANCSUB (1994), which instituted the Zoological Registry in 1995 and manages the Herd Book. Raising Bísaro today is an act of conservation: of a breed, a territory, and a method.